Receivables, Net (Tables)

12 Months Ended

Dec. 31, 2017

Receivables [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable

Receivables, net (in thousands)

December 31,	2017		2016
Construction contracts completed and in progress:
Billed	$	252,467	$	206,570
Unbilled	77,135		81,590
Retentions	91,135		84,878
Total construction contracts completed and in progress	420,737		373,038
Construction material sales	42,192		29,357
Other	17,014		17,523
Total gross receivables	479,943		419,918
Less: allowance for doubtful accounts	152		573
Total net receivables	$	479,791	$	419,345